Some calls are made using the wrong outgoing number

When making some calls, the outgoing number configured for the telephone in the FRITZ!Box is not used. For example, individual telephone calls are made using your landline instead of via Internet telephony (VoIP).

Note:The configuration procedure and notes on functions given in this guide refer to the latest FRITZ!OS for your FRITZ!Box.

Simply proceed as described below. After each measure, check whether the issue persists.

1 Using a different outgoing number to call back

If there is a missed call in the "Call List" and you would like to use your FRITZ!Fon to call the number back, the FRITZ!Fon uses the number that was called to do so. However, you can use a different outgoing number to call back:

Press the "Menu" key on the telephone.

Scroll to "Settings" and press "OK".

"Telephony" > "OK" > "Own telephone no." > "OK"

Select the desired outgoing number.

Click "OK" to save the setting.

Now the telephone number is shown in the display of the telephone and will be used as the outgoing number for the next call.

2 Deleting dialing rules

There may be dialing rules configured in the FRITZ!Box that force the call to be made using a different outgoing number. Therefore, you must delete all unsuitable dialing rules:

3 Disabling substitute connection

When the function "Use substitute connection" is enabled, the FRITZ!Box automatically attempts to use a different number to make the call if is not possible to do so using an Internet telephone number. You will hear an acoustic signal (two short tones and one longer tone) in the telephone if a landline number is used for the call. If a different Internet telephone number is used for the call, you do not hear an acoustic signal. You can disable this function in the FRITZ!Box: